DeclarativeDropArea.h

/*
    SPDX-FileCopyrightText: 2010 BetterInbox <contact@betterinbox.com>
    SPDX-FileContributor: Gregory Schlomoff <greg@betterinbox.com>
 
    SPDX-License-Identifier: MIT
*/
 
#ifndef DECLARATIVEDROPAREA_H
#define DECLARATIVEDROPAREA_H
 
#include <QQuickItem>
 
class DeclarativeDragDropEvent;
 
class DeclarativeDropArea : public QQuickItem
{
    Q_OBJECT
    QML_NAMED_ELEMENT(DropArea)
 
    /**
     * If false the area will receive no drop events
     */
    Q_PROPERTY(bool enabled READ isEnabled WRITE setEnabled NOTIFY enabledChanged)
 
    /**
     *
     */
    Q_PROPERTY(bool preventStealing READ preventStealing WRITE setPreventStealing NOTIFY preventStealingChanged)
 
    Q_PROPERTY(bool containsDrag READ containsDrag NOTIFY containsDragChanged)
 
public:
    DeclarativeDropArea(QQuickItem *parent = nullptr);
    bool isEnabled() const;
    void setEnabled(bool enabled);
 
    bool preventStealing() const;
    void setPreventStealing(bool prevent);
    bool containsDrag() const;
 
Q_SIGNALS:
    /**
     * Emitted when the mouse cursor dragging something enters in the drag area
     * @param event description of the dragged content
     * @see DeclarativeDragDropEvent
     */
    void dragEnter(DeclarativeDragDropEvent *event);
 
    /**
     * Emitted when the mouse cursor dragging something leaves the drag area
     * @param event description of the dragged content
     * @see DeclarativeDragDropEvent
     */
    void dragLeave(DeclarativeDragDropEvent *event);
 
    /**
     * Emitted when the mouse cursor dragging something moves over the drag area
     * @param event description of the dragged content
     * @see DeclarativeDragDropEvent
     */
    void dragMove(DeclarativeDragDropEvent *event);
 
    /**
     * Emitted when the user drops something in the area
     * @param event description of the dragged content
     * @see DeclarativeDragDropEvent
     */
    void drop(DeclarativeDragDropEvent *event);
 
    // Notifiers
    void enabledChanged();
 
    void preventStealingChanged();
 
    void containsDragChanged(bool contained);
 
protected:
    void dragEnterEvent(QDragEnterEvent *event) override;
    void dragLeaveEvent(QDragLeaveEvent *event) override;
    void dragMoveEvent(QDragMoveEvent *event) override;
    void dropEvent(QDropEvent *event) override;
 
private Q_SLOTS:
    void temporaryInhibitParent(bool inhibit);
 
private:
    void setContainsDrag(bool dragging);
 
    bool m_enabled : 1;
    bool m_preventStealing : 1;
    bool m_temporaryInhibition : 1;
    bool m_containsDrag : 1;
    QPoint m_oldDragMovePos;
};
 
#endif